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Decoder for B&O remote control.

 
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John_Rio



Joined: 22 Jan 2005
Posts: 12
Location: Rio de Janeiro, Brazil

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Decoder for B&O remote control.
PostPosted: Fri Feb 25, 2005 2:10 pm     Reply with quote
I was looking a long time for something like this, but ended up doing it by myself.
I anybody wants it, here it is.

The input B0 is connected to a infrared link receiver (B&O product) that gives 5 V pulses.

I did not try it with a standard infrared receiver.

The code is simple and can be adjusted to your own needs.

When a key is pressed on the remote, the PIC sends a string containing the 16 byte code. (send as A,B,C) since each "bit" has 3 states.

John (Still in Denmark)

Code:

#include <18F252.h>
#device ICD=TRUE
#device adc=8
#use delay(clock=20000000)
#fuses NOWDT,WDT128,EC_IO, NOPROTECT, NOOSCSEN, BROWNOUT, BORV20, NOPUT, STVREN, NODEBUG, LVP, NOWRT, NOWRTD, NOWRTB, NOWRTC, NOCPD, NOCPB, NOEBTR, NOEBTRB
#use rs232(baud=19200,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,enable=PIN_C5)

INT8  Counter=0;
INT16 time[25];
INT1  Received=0;
INT1  fejl;
INT8  Code[17];

#int_EXT

EXT_isr()
{
 time[counter]=get_timer0();
 set_timer0(0);
 Counter++;
 IF (counter==22)Received=TRUE;
}

#int_TIMER0
TIMER0_isr()
{
counter=0;
}

void Check_Start_Stop()
{
fejl =0;
IF (time[1]<5250 || time[1]>10500) {fejl=1;Break;}
IF (time[2]<5250 || time[2]>10500) {fejl=1;Break;}
IF (time[3]<33500 || time[3]>42000) {fejl=1;Break;}
IF (time[4]<5250 || time[4]>10500) {fejl=1;Break;}
IF (time[21]<26000 || time[21]>33500) {fejl=1;Break;}
}
void Check_Code()
{
INT8 i;
For (i=0;i<=15;i++)
 {
  IF (time[i+5]<5250) fejl=1;
  IF (time[i+5]>5250) code[i]='A';
  IF (time[i+5]>10500) code[i]='B';
  IF (time[i+5]>18250) code[i]='C';
  IF (time[i+5]>26000) fejl=1;

 }
}
void read_remote()
{
Check_start_stop();
IF (!fejl)
 check_code();
 IF (!fejl)
 {
 code[16]=0x00;
 Output_High(PIN_C5);
 Delay_us(500);
 printf(code);
 printf("\r");
 }
received=0;
}

void main()
{

   setup_adc_ports(NO_ANALOGS);
   setup_adc(ADC_OFF);
   setup_spi(FALSE);
   setup_wdt(WDT_OFF);
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_2);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DISABLED,0,1);
   setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
   enable_interrupts(INT_EXT);
   enable_interrupts(GLOBAL);
   enable_interrupts(INT_TIMER0);
   DO
   {
   IF (received) read_remote();
   }
   WHILE (true);

}


Last edited by John_Rio on Tue Mar 01, 2005 1:53 pm; edited 1 time in total
John_Rio



Joined: 22 Jan 2005
Posts: 12
Location: Rio de Janeiro, Brazil

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UPS. A small code mistake.
PostPosted: Fri Feb 25, 2005 2:42 pm     Reply with quote
The code in Check_Start _Stop is wrong.
It has to be:
Code:

IF (time[1]<5250 || time[1]>10500) {fejl=1;Break;}
IF (time[2]<5250 || time[2]>10500) {fejl=1;Break;}
IF (time[3]<33500 || time[3]>42000) {fejl=1;Break;}
IF (time[4]<5250 || time[4]>10500) {fejl=1;Break;}
IF (time[21]<26000 || time[21]>33500) {fejl=1;Break;}


Sorry about that.

John

Last edited by John_Rio on Wed Mar 02, 2005 5:27 am; edited 2 times in total
treitmey



Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA

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PostPosted: Mon Feb 28, 2005 10:00 am     Reply with quote
..

Last edited by treitmey on Wed Mar 02, 2005 12:45 pm; edited 3 times in total
John_Rio



Joined: 22 Jan 2005
Posts: 12
Location: Rio de Janeiro, Brazil

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Done the edit.
PostPosted: Tue Mar 01, 2005 1:56 pm     Reply with quote
Hi,
Sorry about the mistake.
I didnt know posts could be edited after posting.
I can though not find a way to delete my correction post !!


John
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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Re: Done the edit.
PostPosted: Tue Mar 01, 2005 2:35 pm     Reply with quote
John_Rio wrote:
Hi,
Sorry about the mistake.
I didnt know posts could be edited after posting.
I can though not find a way to delete my correction post !!


John


Just edit it and delete the text.
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